Apparatus for finishing forgings



Nov. 19, 1946. A. R. WALPOLE APPARATUS FOR FINISHING FORGIN GS 4Sheets-Sheet 2 Filed Jan. 20, 1945 F/GZ I N VEN TOR. 41/6250 2 144441015 BI MM CM.

Nov. 19, 1946.

A. R. WALPOLE APPARATUS FOR FINISHING FORGINGS 4 Sheets-Sheet 3 FiledJan. 20, 1945 4 7 7 OP/VE K5 415950 2 W44 ou:

Patented Nov. 19, 1946 2,411,399 APPARATUS FOR FINISHING FORGINGS AlfredB. Walpole, Chicago, Ill., assignor to American Brake Shoe Company, NewYork, N. Y., a corporation of Delaware Application January 20, 1945,Serial No. 573,776

.6 Claims.

1 V This invention relates to forging of metal parts and it relatesparticularly to the punching and/ or trimming of such forging after theusual forging operations have been performed.

In the production of metal forgings, it is of ,course necessary that theprovision be made in the forging dies for sufficient draft to allowready separation of the dies from the forging as the forging operationprogresses or is completed.

.,Ordinarily, the draft or sloping surfaces thus formed by the dies onthe forgings is unobjectionable as to many sides or surfaces of theforging, but in respect to those sides or surfaces that are to serve ina functional sense for purposes of mounting, bearing, power transmissionor the like, such draft on the forging must be removed, and to enablethis to be done in a simple and expeditious manner is an importantobject of this invention.

In accordance with usual practice it is customary to trim the flash fromthe edges of a forging, and it is customary to punch out slugs thatdivide the aligned recesses where a bore is to be thereafter formed in aforging, but these operations are customarily so performed that thedraft on the forging is allowed to remain in place. Trimming of suchflash, and the punching of such slugs from a forging in accordance withprior practice has required relatively careful handling of the forgingso as to be sure that the form of the work piece that has been attainedin the forging operation will not be destroyed or distorted in thecourse of the trimming and the punching operation, and it is a furtherobject of the present invention to simplify and expedite the trimmingand punching of forgings that the desired form of the forging willinvariably be maintained. A further. and related object of the inventionis to enable the critical surfaces of a forging to be held and supportedin the desired form while the forging is trimmed and punched, and toenable such trimming and punching operations to be so performed that theflash and the slug as well as the draft will be removed.

More specifically, it is an object to so perform the trimming operationson a forging that the draft on the critical surfaces thereof will beremoved and such critical surfaces will be so formed as to materiallysimplify further metal working or machining operations that are to beperformed on the forgings.

Other and further objects of the present invention will be apparent fromthe following description and claims and are illustrated in the accompanying drawings which, by way of illustration,

show a preferred embodiment and the principle thereof and what I nowconsider to be the best mode in which I have-contemplated applying thatprinciple. Other embodiments of the invention embodying the same orequivalent principle may be used and structural changes may be made asdesired by those skilled in the art without departing from the presentinvention and the purview of the appended claims.

In the drawings:

1 Fig. 1 is a side elevational view of a punching and trimming apparatusconstructed in accordance with the present invention, such View beingtaken substantially along the line l--l of Fig. 2;

Fig. 2 is a vertical sectional View, taken substantially along the line2-2 of Fig. 1, and showing the elements of the punching and trimmingapparatus in their separated or rest positions, and with a work piece inposition on the lower die element of theapparatus;

Fig. 3 is a view similar to Fig. 2 and showing the elements of thepunching and trimming apparatus after the forging or work piece has beenclamped in position and prior to the start of the punching and trimmingoperations; and

Fig. 4 is a view similar to Figs. 2 and 3 and illustrating the elementsof the punching and trimming apparatus after completion of the punchingand trimming operation and before the elements of the apparatus havestarted their relative separating movement.

In the form chosen for disclosure herein, the invention is embodied in acutting and trimming apparatus In that is shown in elevation in Fig. 1of the drawings. this cutting and trimming apparatusbeing adapted formounting in conventional press equipment, and as herein shown thecutting and trimming apparatus I0 is illustrated as mounted in aconventional punch press ll having spaced vertical columns [2 with a bed13 between the columns 12 near their lower ends and having a ram or head14 disposed upwardly from the bed l3 and mounted for verticalreciprocation between the columns l2.

The punching and trimming apparatus of the present invention includes astationarily mounted lower portion i5 and a movable upper portion 16that is in the present case carried on the ram ll of the press. Thelower or stationary portion 15 of the apparatus includes a lower dieshoe 20 secured in a conventional manner upon the bolster plate 2! ofthe press, such bolster plate 2| being disposed upon the bed l3. The dieshoe 20 is in the form of a relatively thick flat plate and serves as amounting for a lower die 22 upon which the work piece such as a forgingW is rested and supported during the punching and trimming operation. Aswill be evident in Fig. 2 of the drawings, the lower die 22 has aprojection 23 on its lower face that fits into a complemental reces inthe die shoe 29, and the die 22 is held in place-by cap. screws 24.extended .npwardly through fthe' die shoe and .;threaded izinto. thelower die 22. In the present instance the apparatus It is fittedparticularly for the punching and trimming of a wheel-like work piece Whaving a hub 25, an annular webs26 :and an outer rim 27, as indicated inFig. 2" ofthe drawings. In the final form of the work piece W thafltxisherein shown, there is to be a centralboreiformed therein, as shown inFig. 4 of the drawings, and in order that this bore may readily beformed in the work piece W, the forging operation is arranged to aifordaligned recesses 28 that are disposed on the axis of the hub and thatare .divided'or separated by a web or slug 29. It will be evident inFig. 20f the drawings that each of the recesses 28 has walls tapered asat 36 so as to afford the draft required forthe forging tools or dies inthe course of the forging operation. similarly the outer surfaces of thehub 25are of a sloping form as indicated'at 3| in-Fig. 2, whilecorresponding draft is provided "at 32 on the inner face of the rim 21.The outerf'aces'ofthe'rim 21 also have a sloping surface '3'3.thatafford the necessary draft, and "these surfaces 33 ordinarily merge intothe flash that is formed along the :parting line .of the'fo'rging diesused in forging operation.

It will begrecognize'd thatlin different kinds and withdifferent formsof work piece W, there will be considerable variation in the surfacesthat are considered to be critical and which are torbeused in mountingor in the'transmission of power by the work piece .or for otherfunctionalj'purposes, butinthe present instance, the outer periphery ofthe rim 2! of the work piece may be intended .for further machiningoperations for the purpose of forming gear teeth thereon, or.rnaybe'inten'ded to .serve as ,a rolling surface in the event that the .workpiece is to be utilized a-s.a roller. Further- .more, the central boreof the Work piece 'W herein .shown is considered to bea critical Surfacethat will in .most instances be subjected to further machiningoperations, .and in accordance with i the presentinvention the punchingand trimming apparatus is. constructed and arranged to trim the flash'34 and thedraft 33 from the. outer periphery of the .rim 2.! .and topunch. the draft '38 and the slug '29 .from the hub .25 thereby toprovide a cylindrical. outer surface on therim 2'! anda con--centriccylindricalicentral bore in the hub 25.

In order that such punching and trimming operations may be performedwhile maintaining the desired form of the element-s of the forging W,theilowendie22 and an upper die 40 are arranged to embrace the workpiece W so as to maintain the form of the workpiece Wwhile the punchingand trimming operations are performed. To this end, the upper face ofthe .lower die 22 is formed so as to.a.ccurately engage the lowerendsurface of the hubf25, the draft surface 3|, lower half .of the hub 25,.thelower faceof the web 26, the draft surface .32 of the rim 2'! andthelower side face .of;the-rim 127. In practice, the work piece Wis.placedina position of thelower die 22, as shown .inFigj2, while theraml4 and the upper die are in .the uppenor. retracted position of Figs. 1and .2, .and this is done immediately after the completion of theforging operation so that the a bearing sleeve 56 fixed within workpiece W is still at substantially the same temperature as it was whenthe forging operation was completed. After the forging W has been placedin position on the lower die 22, the upper die 40 is brought down intoengagement with the upper surface of the work piece W, as

.showninFi 3, after which the punching and trimming aoperationsiareperformed while the work piece W is firmly held "between'the lower andupper dies 22 and 40.

In order that the upper die 4!! may be moved into itsactive position ofFig. 3 and may yet be carried .upon the upper head 14 of the press, the

.mounting of -.the 'upper die 40 is related to the ported on the punchholder M that is "fixed by means including dovetail member upon "thelower face of the head of ram M of the press. The mounting of thetrimming ring 43 and-the punch 42 is, in accordance w'iththe presentinvention, such as to cooperate in affordingsupporting and guiding meansfor the upper die lll. Thus the trimming "ring '43 is secured upon thelower end of a supporting member 46,- this supporting member in thepresent case "being'generally cylindrical'in both its inner'andouter-form and having two opposite sides flattenedforclearance purposesas willhereina fter appear. The supporting member '45 has its upperendrecessed into the punch support 44 at 44A, andissecured in positionby cap screws 45A. The trimming ring 13 is in the present instancesecured in a position in a locating groove in the lower faceof thesupporting member 46 by cap screws 48 as shown in Fig. 2 ofthe-drawings. "The'punch-M is,in the present case, sectional incharacterso as to enable the lower en'd'por-tion thereof to be readilyreplaced, and where this arrangement is employed, the upper or mountingportion of the punch has a head that is disposedagainst the lower faceof the punchholder Mandsecured in this position by cap screws 50.

The punch 42 serves as guidingmeanslfor locating the upper die4'0 inproper position'for engagement with the upper-surfaces of the forging W,and in attaining such guiding action, the

upper die 40 is mounted on an upper dieholder SE-that is disposed withinthe mounting member 45. The upper die holder '55 "hasa longitudinalopening therein that surrounds the punch "42, and

this central opening is arranged to'have bearing engagement with theupper enlarged portion 42A of the punch 42. When the head or.ram M ofthe press is in its upper position of Fig. 2, 'the upper die holder islocated in its most lower position with respect to the punch 42 and themounting member 46, this position being determined by :a downwardlyfacing annular shoulder 5'! formed on the dieholder 55 and engaged atthis time with an inwardly projected annular flange or shoulder 58formed on the mounting member'46.

The upper die holder -55 is 'urged downwardly toward-this position by anexpansive coil'spring v relatively deep annular groove '62 'extendeiiinto the upper face of'the die holder55. In the'pres ent case, the upperdie 40 is held in position on the lower end of the die holder 55 by capscrews 63 that are extended downwardly from the bottom of the annulargroove 52 and are threaded into the die 40. The die 40 is positioned ina lateral sense by a projection 54 that is seated in a complementalrecess in the lower face of the upper die holder 55.

When the ram i4 is in its upper position, the

die holder 55 is in the relative position determined by the shoulder 58,and the lower end portion of the punch 42 is disposed in a central bore40A formed in the die 49, while the trimming ring 43 is disposedconsiderably above the lower or effective surfaces of the die 40, aswillbe evident in Fig. 2 of the drawings. It will also be observed thatthe lower surfaces of the upper die 40 are formed so as to becomplemental with the upper end surfaces of the hub 25 of the workpiece, the draft surface 3| of the hub, the upper surface of the web 26,and the upper side surface of the rim 21, and when a punching andtrimming operation is to be performed these complemental surfaces of theupper die 40 are brought into engagement with the upper surfaces of theforging W before the punching and trimming operations are performed,thereby to maintain the forging in the proper form while the punchingand trimming operations are performed. Thus, as will be evident bycomparison of Figs. 2 and 3 of the drawings, the downward movement ofthe ram l4 first acts to cause such en gagement of the upper die 4|]with the forging W. In order that the die 40 may accurately match inevery instance with the forging W located on the lower die 22, thedownward move- ,ment of the upper portion of the apparatus is accuratelyguided with respect to the lower portion l5 of the apparatus. Suchguiding action is in the present instance accomplished through theprovision of a plurality of guide or leader pins 65 as shown in Fig. 1of the drawings, such leader pins being extended upwardly from each ofthe four corners of the die shoe 20 in a perpendicular and rigidrelation thereto. Each leader pin 55 is extended into a guiding bushing66 that is bolted at B1 to the corresponding corner of the lower face ofthe punch holder 44, and with this construction the downward movement ofthe ram 14 and the punch holder 44 causes the guide bushings to ridedownwardly in accurately guided relationship along the leader pins 65.In the course of such downward movement, the upper die 40 is engagedwith the upper surface of the forging W, and as the downward movement ofthe ram I4 further progresses, the spring 60 is compressed so as toapply substantial clamping and positioning forces to the die 46. In thecourse of such further downward movement, the punch 42 and the trimmingring 43 move downwardly and into the operative relationship to theforging W, the arrangement in the present instance being such that thepunch 42 first enters upon its punching operation prior to theengagement of the trimming ring 43 with the forging. With thisarrangement the punching and trimming operations are completed atsubstantially the same time.

The punch 42 acts, as will be evident from a comparison of Figs. 3 and4, to punch the draft 30 as well as the slug 29 from the hub 25 0f theforging, and the slug and the associated material are dischargeddownwardly through a dis posal opening H! formed in the lower die 22 and'in the die shoe 20 and the bolster plate and bed of the press. Thetrimming ring 43 serves to trim the draft- 33 as well as the flash 34from the periphery of the rim 2'! of the forging, and this material isin the form of a ring that may cling to the outer surfaces of the lowerdie 22. For this reason, an annular stripper ring H is dispose-d insurrounding relation to the lower die 22, this stripper ring beingguided for vertical movement on guide studs 12 that extend through aflange I IA of the stripper ring and are threaded into the die shoe 20.An expansive coil spring 13 surrounds each of the guide-studs 12 so asto urge the stripper ring 1| in an upward direction when the trimmerring 43 is withdrawn. The springs 13 are, of course, compressed by anymaterial that may be disposed between the trimmer ring 43 and thestripper plate H, andit may be here observed that the flash and othermaterial cut from the work piece W have not been shown in Fig. 4 of thedrawings, although such material would, in fact, be present at the stageof operation that is illustrated in Fig. 4. Upon completion of thepunching and trimming operation, the ram I4 is withdrawn in an upwarddirection, and as such withdrawal movement progresses from therelationship shown in Fig. 4 to the relationship shown in Fig. 3, thespring 60 gradually expands so as to maintain an upper die in engagementwith the forging W. When the ram has reached the position shown in Fig.3, the flange 58 engages the shoulder 51 upon the upper die holder 55,thereby to move the die holder 55 with the supporting member 45 in thecontinued upward or withdrawing movement of the ram, and at thecompletion of the upward stroke of the ram, the parts attain theposition shown in Fig. 2 of the drawings.

Under some circumstances the trimming ring 43 may not strip properlyalong or with respect to thesides 0f the forgin W, or the punch 42 maynot strip properly in an upward direction from the central bore of theforging W, and in such a situation, the forces acting between thetrimming ring 43 and the forging, or between the punch 42 and theforging, may be of such a magnitude that the spring 60 will be unable tomaintain the die 40 in its lower position while the ram I4 is beingwithdrawn to the position of Fig. 3. When this occurs it is desirable tohave a positive stripping force applied so as to strip the completedforging W from the punch 42 and from the trimming ring 43. In accordancewith the present invention, therefore, a lost motion connecting means isprovided between the upper die holder 55 and the lower die shoe 20 insuch a way that positive stripping forces are applied in the event thatthe spring 55 does not attain the desired stripping action. As hereinshown, this lost motion connection includes a pair of pins 15 extendedin opposite directions outwardly from the upper die holder 55 andthrough slots N5 formed in the mounting member 46 so as to open throughthe opposite outer flat surfaces. Each of these pins 15 has a link 1'!pivotally supported thereon to depend therefrom along the adjacent outerflat surfaces of the mounting member 46, and the lower ends of theselinks are arranged to ride in a slidable relation within upstandingsleeves 18 that are secured rigidly on the die shoe 2!]. The sleeves 18have slots 19 formed in their opposite sides, such slots terminatingshort of the upper ends of the sleeves l3, and each link T! has atransverse pin in its lower end that extends in opposite directionsoutwardly through the slots 19 of the related sleeve 18. Therelationship of the slots Hand the-pinstil is such that when theupper-Edie holder-155 has reached the height at which it is located inFig. 2, the pins 80 will engage the upper ends of the slots 79. Thus, itwill be clear that if the forging W does not strip from the trimming.ring-43-and thereby causes the upper die holder 55 to remain in theposition shown in Fig. 4 with respect tothe mounting member 46, then asthe .upward or withdrawing stroke of r the ram M progresses, thedieholder 55 will reach the upper position of Fig. 2 prior to the time whenthe punch 42 and trimming ring 43 have reached end upper portions,andunder such circumstances the links 11 will -restrain the die holder'55 against further upwardmovement and hence, further upward withdrawalof the "ram It will forcibly withdraw the trimming ring 43 and the punch42 upwardly so -as to effect the stripping .of the forging from thecutting tools.

sInthe use of the punching and trimming apparatus of this invention, itwill be observed that the surfaces of the forging are firmly supportedat all times exceptwhere the punching or trimming operations are to beperformed, and as will be evident in Fig. 4 of the drawings, the uppersurfaces of the lower die 22 where such surfaces border theopening Iiiare arranged to support the lower surface of the hub .25 relativelyclose to the border of a central bore that is to be punched by the punch42, and hence, the action of the lower die 22 at this point preventsdistortion of the lower surface of the .hubl25. 'Ihecorresponding .uppersurfaceo-f thehub 25 is of course held in the proper formby the portionsof the upper die 40 that surroundand define the central opening 40A ofthe upper die, while the other surface of the upper and lower die engagethe surfaces of the work piece so as to prevent distortion of theportions of the forgin in the course of the punching and trimmingoperations. With respect to the outer edge portions of the rim 21 of theforging,

it will be observed that the edge surfaces of the a rim are engaged bythe upper and lower dies substantially to the outer periphery of the rimthat is to be defined by the trimming operation, and thus the rim isheld accurately in the desired form as the trimming operationprogresses.

Since the forging W is clamped betweenvthe upper and lower die with asubstantial'force afforded by the spring 60, such clamping action may beadvantageously utilized to effect stamping of identification numbers andthe like in the surfaces of the forging, and as indicated in desiredoutline, in Fig. 2 of the drawings, a stamping die 85 may be mounted inthe lower die 22 so as to form an impression in a portion of the forgingwhen the forging is forced downwardly by the action of the upper die it.Thus the usual operation of manually applying such marking or otheridentification to the forging may be eliminated where the-punching andtrimming apparatus of the present invention is employed,

From the foregoing description it will be evident that the presentinvention enables forgings to be punched and trimmedin .asimple andexpeditious manner, and this isaccomplished insuch a way that the formof the forging is maintained at all times. Moreover, thepunching andtrimming appar'atus of the present invention,-by engaging and supportingall of the surfacesof the forging except those that are to be punched ortrimmed, en ables relatively large amounts of material in such punchingand trimming operations. Because of this advantageous arrangement, .it ipossible to remove not only .theslug and the flash from the myself .ofsuch changes 8 forgings but also to remove the. draft from the criticalsurfaces of'the forging, and lbecause of this, the further machining orother ,finishingrof' such critical surfaces of the forging ,ismaterially simple. The punching and trimming apparatus at the presentinvention is rugged in character, and the arrangementiis suchthat properstripping action is obtained in every instance.

Thus, while I have described the .preferredembodimentof myinvention, itis to be understood that these are capable of variation and modificationand I therefore do not wish to be limitedto the precise details set,forth, but desire toavail and alterations as fall within the purview ofthe following claims.

v..I claim:

1.,In a trimming apparatus for trimming ,a forging, a die holder and anupper holder ,plate, means guiding said .holderplate for movement alonga predetermined path toward and away .from.said die holder, a lower vdiemounted on said die "holder in a fixedposition and having surfacesthereon eomplemental .to those lower surfaces of a forging that are tobe maintained in proper forrnduring trimming of the forging, an .upperdie havinglower surfaces complemental .to those upper surfaces of aforging that are tobemaintained in properlform lduring trimming of theforging, an upper di holder upon which said upper :die is secured, amounting member having an enlarged central chamber .therein'in whichsaid upper die holder is disposed, means securing the upper end of saidmountingmember on said upperholder plate, cooperating shoulders on saidupper die holder and on said mounting member to limit downward movementof said upper die holder relative to said mounting member, means actingyieldingly between said upper holder plate and said upper die holder tourge said upper die :holder in a downward direction, and cutting meansmounted in fixed relation to said upper holder plate and extendeddownwardly therefrom for trimming a, predetermined surface of clampedand supported forging in the cours of downward movement of said upperholder with respect to said lower dieholder.

v2. In a combination punching and trimming apparatus for trimming thedraft from the rim of a forging and for removing the slug and the draftfrom an opening that is to be formed in the forging,a die holder and anupper holder .plate, leader pins and bushings ,gui'ding said holderplate formovement along a predetermined path toward and away fromisaiddie holder, ,a lower die mounted on said die holder in a ,fix'edposition and having surfaces thereon ,complemental to those lowersurfaces of a forging that are to be maintained in proper form duringpunching and trimmingof the forging, .an upper die having lower surfacescomplemental .to those upper sup. faces of a forging that proper formduring punching andtrimming of the forging an i per dieholder upon whichsaid upper die .is secured,,amountingmember having an enlarged centralchamber therein in which said.upperldie holder is disposed, meanssecuring the upper ,end of said mounting member on said upper holderplate, cooperating shoulders on said upper ,die holder plate,cooperating shoulderson said upper die holder and on saidmounting memberto limit downward movement of said upper die, holderrelative to saidmounting ,member, expansive coil spring means acting between said upperholderplate and said upper die holder to urge said upper-di holder'in adownward are to be maintained in direction, said upper die and saidupper die holder having alig'nedvertical bores therein, a punch fixed onsaid upper holder plate and extended downwardly through said upper dieholder and into the opening in said upper die, and a cutter ringsecured. to a lower nd or said mounting member for removing the draftfrom the outer surface ofthe rim of a forging in the course of downwardmovement of said upper holder with respect to said lower die holder.

3. In a combination punching and trimming apparatus for trimming thedraft from the rim of a forging and for removing the slug and the draftfrom an opening that is to be formed in theforging, a die holder and anupper holder plate,leader pins and bushings guiding said holder platefor movement along a predetermined path toward and away from said diholder, a lower die mounted on said die holder in a fixed position andhaving surfaces thereon complemental to those lower surfaces of aforging that are to be maintained in proper form during punching andtrimming of the forging, an upper die having lower surfaces complementalto those upper surfaces of a forging that are to be maintained in properform during punching and trimming of the forging, an upper die holderupon which said upper die is secured, a mounting member having anenlarged central chamber therein in which said upper die holder isdisposed, means securing the upper end of said mounting member on saidupper holder plate, cooperating shoulders on said upper die holder andon said mounting member to limit downward movement of said upper dieholder relative to said mounting member, expansive coil spring meansacting between said upper holder plate and said upper die holder to urgesaid upper die holder in a downward direction, said upper die and saidupper die holder having aligned vertical bores therein, a punch fixed onsaid upper holder plate and extended downwardly through said upper dieholder and into the opening in said upper die, a cutter ring secured toa lower end of said mounting member for removing the draft from theouter surface of the rim of a forging in the course of downward movementof said upper holder with respect to said lower die holder, and meansacting between said upper die holder and said lower die holder to limitseparating movement thereof to an amount that is less than the stroke ofsaid punch.

4. In a combination punching and trimming apparatus for trimming thedraft from the rim of a forging and for removing the slug and the draftfrom an opening that is to be formed in the forging, a die holder and anupper holder plate, leader pins and bushings guiding said holder platefor movement along a predetermined path toward and away from said dieholder, a lower die mounted on said die holder in a fixed position andhaving surfaces thereon complemental to those lower surfaces of aforging that are to be maintained in proper form during punching andtrimming of the forging, an upper die having lower surfaces complementalto those upper surfaces of a forging that are to be maintained in properform during-punching and trimming of the forging, an upper die holderupon which said upper die is secured, a mounting member having anenlarged central chamber therein in which said upper die holder isdisposed, means securing the upper end of said mounting member on saidupper holder plate, cooperating shoulders on said upper die holder andon said mounting member to limit downward movement of said upper dieholderrelative to said mounting member, expansive coil spring meansacting between said upper holderplate and said upper die holder to urgesaid upper die holder in a downward direction, said upper die and saidupper die holder having aligned vertical bores therein, a punch fixed onsaid upper holder plate and extended downwardly through said upper dieholder and into the opening in said upper die, a pair of slots formed inopposite sides of said mounting member and extended parallel to saidpunch, a pair of pins extended outwardly from said upper die holderthrough said slots on opposite'sides of said upper die holder, and meansaffording a lost motion connection between said pins and said lower dieholder to limit upward withdrawing movement of said upper die holder soas to thereby insure stripping of a forging from said punch as anincident to upward separating movement of said upper holder plate withrespect to said lower die holder.

5. In a combination punching and trimming apparatus for trimming thedraft from the rim of a forging and for removing the slug and the draftfrom an opening that is to be formed in the forging, a die holder and anupper holder plate, leader pins and bushings guiding said holder platefor movement along a predetermined path toward and away from said dieholder, a lower die mounted on said die holder in a fixed position andhaving surfaces thereon complemental to those lower surfaces of aforging that are to be maintained in proper form during punching andtrimming of the forging, an upper die having lower surfaces complementalto those upper surfaces of a forging that are to be maintained in properform during punching and trimming of the forging, an upper die holderupon which said upper die is secured, a mounting member having anenlarged central chamber therein in which said upper die holder isdisposed, means securing the upper end of said mounting member on saidupper holder plate, cooperating shoulders on said upper die holder andon said mounting member to limit downward movement of said upper ber,expansive coil spring means acting between said upper holder plate andsaid upper die holder to urge said upper die holder in a downwarddirection, said upper die and said upper die holder having alignedvertical bores therein, a punch fixed on said upper holder plate andextended downwardly through said upper die holder and into the openingin said upper die, a yieldably mounted separating ring mounted on saidlower die holder in surrounding relation to said lower die for strippingmaterial from said lower die, and means affording a lost motionconnection between said upper die holder and said. lower die holder toinsure stripping of a forging from said punch as an incident to upwardwithdrawing movement of said upper holder plate.

6. In a combination punching and trimming apparatus for trimming thedraft from the rim of a forging and for removing the slug and the draftfrom an opening that is to be formed in the forging, a die holder and anupper holder plate, leader pins and bushings guiding said holder platefor movement along a predetermined path toward and away from said dieholder, a lower die mounted on said die holder in a fixed position andhaving surfaces thereon complemental to those lower surfaces of aforging that are to be maintained in proper form during punching andtrimming of the forging, an upper die having die holder relative to saidmounting memi1 c lower surfaces" c'ompleiiiental tothose uppersurfacesof: a forging that are to be maintairle'din proper form'during" punchingand trimming of the forging, an upper die'holder upon which said upperdie is secured, a mounting' member having an enlarged central chambertherein in which said upper die holder is disposed, means securing theupper end of said mounting member on said upper holder plate,cooperatingshou-lders on said upper die holder and on saidmountingmember tolimit downw ard movement of said upper holder relative to saidmounting member, expansive coil spring:.means acting between said upperholder plate and said; upper die holder to urge-said upper die holder'ina downward direction; saidupper die andsaid upper die holderhavingaligned vertical bores th'erein, a punch fixed on said upperholder plate-and extended downwardly through said upper die'holder andinto theopeninginsaid upper 12 die; at pair-of-"slbts'formedin'oppbs'ite 512183701 3313 mp n'ti'ng' member: and extended parallelto.said punch, a, pair or pins extended? outwardly from said upper dieholder"throughwaid'slotsfonloppoe siteside'siof saiduppjer die, holder;a pairjof links one of which. is suspended fromleach ofsaidpin's; a pairof sleeves fixedon saidlowe'rdieh'oldeiiin alignment withsaididepending' links and su'r rounding said links so thatsaidllinksmaynmov'e vertically thereirL'each of said sleeves having at least oneverticall slot Y formed therein, and each of: said links having,altra'nsverse' pin therein. exl tendedoutwardly. through the slot in.the sleeve in: whichthelinl; is positioned,saidlslots and said pinsbeing sorelated'as to permitlfree' downward movement-of said upper dieholder; butto limit upward movement ofa'said" upper die to therebyinsure stripping-of a1 forging from said punchu ALFRED R; WALPOLE.

